1 what color clothes does he like
clothing一般是衣服的总称,所以这要用clothes .
2 嗯,用in 的话,后面加的是 颜色
what colour clothes does he wear today
3 嗯嗯,没错 !
4 what color is/are her skirt/trousers which she wears .
用了个定语从句,有些冗杂.还没想到更好的,只能这样写了
5 it will be better if i could know you earlier .
6 If i have known you before several years ,maybe it will not be like this situation.